Check-valve.



H. O. JACKSON.

Ptented Mar. "11, 1919.

A M7? w I 9W ,I v E? S f A i 1,297,2ae.

.i useful Improvements in UNITED sTATEs PATENT ,oEETon n' HENRY o. JACKSON, or DENVER, COLORADO, AssiGNOR-TO THE JACKSON COMPRESSOR COMPANLOE DENVER, COLORADO, A conronATIoN or COLORADO.

CHECK-VALVE.

Specification of Letters Patent.

Patented Mar 11,1

application mea my 1s, 191e. serial No, eazs.

'To all fwlwme't may concern:

a 'citizen of the United States, @residing atv the city and county of'Denver and State of Colorado, have invented certain new and Check-Valves; and I do declare the following to be a'full, clear, and exact description Aof the invention, such as will enable other skilled inthe art` to which it appertains to make and use the same, reference being had to the accompanying drawings, and to Ithe characters of reference marked thereon, which form a part of this specication.

My invention relates to improvementsin Vcheck valves, my object being to provide va simple and economical device adapted to eHiciently perform the aforesaid function. My present improvement is well adapted for usein connection with 'air compressors and 1s so constructedthat it controls a port having a relatively large cross sectional area,`

thus distributing the pressure and therefore reducing the wear, incident to this-pressure to a large extent, whereby the efficient durability ofthe constructionis greatly increased.

Generally speaking, my improved construction is composed. of two 'relatively heavy members having staggered passages through which the air passes during the operation of a compressor for instance.

The passage of the air is controlled by means-of thin flat members which are adapted to shown in detail, the valve pleces, however,

cover the inlet passages of one member, be-

ing normally held in place and in the closed position by the back pressure of the air inv the receiverwthough" I preferv to employ springs which" act upon the said controlling devices to normally retain them in the seated position, though these springs are not essential to the operation of 'the structure' as will be readily understood. These thin valveparts or 'pieces are long as compared with bodily and equally the recessed casing member, close a series o f ports which are in communication with the air pressurein the receiver-their object being to allow the backpressure in the receiver to acton the'valvepieces to maintain them normally in the closed position orvl in position to close the inlet passages ofthe companion member except when the receiver pressure acts upon said valve pieces.

instance, the air passing throughthe inlet p'assagesof the corresponding casing member valve pieces to force them away from "the inlet passages and cause them to retreat into lDuring the air compressing operation lfor Y acts upon the relatively thin at long Y the recesses of the opposite casing member,

thus allowing the air from each inlet passage to take a diagonal courseA 'and pass through the staggered passages of the valvepiece-holding member which last named passages, however,

` the valve pieces are-open`, since the edges of fthe vlatter overlap .the vpassagesY with the aforesaid result.

1 `Having briefly outlined my improvement, I will proceed'to describethe same'in detail, reference'being made to the accompanying drawing, in which-is illustrated .an emi bodiment thereof. In this drawingf- Figure 1 is a central longitudinalsection taken througha' conduitin which my'improved check valve is located `and arranged inoperative relation.

' Fig; 2 1s a central section of'theivalve being shown in the openl position as' when the"`valve is used for air compressing purposes. 4 This section maybe indicated by the line 2;-2, Fig. 3.- f

are partly closed when Fig.' 3 is an inner face view of one ofthe members of the v`casing, being the one which I will term the lvalve-piece-holding. part..

v Fig. L is-a similar'view of the companion casing member.

Fig. 5 is aV fragmentary section lof rthevalve, the section being indicated by the line 5-5,' Fig. 3, looking toward the left'.

The same reference characters indicate the same parts 1nv allthe views.

'ich

Let the numeral 5A designate my improved I A' check valve considered in its entirety .and/f' 1 consisting of two casing members 6 and '7 which when the parts are assc`1nbled,ware

` theI mem connected by means of screws 8 which pass through 1plain or untlrreadedopenings 9 in er 6 and enter threaded openings 10 in the member 7.- The member-6 may be termed the inletmember as it contains passages 12 which` the air for instance, enters during the compressing operation; and the member 7 may be termed the exit member as '1t contains passages 13 which the'air traverses on its Way to the receiver, whichl passages 13 are continuously open to or 1n communicationwith the receiver or the Econduit 14 between the check valve and the receiver (not shown). The passages 12 .-in the member and the passages 13 in the member 7.arearranged 1n staggered relation, one set of passages being laterally otfsetfrom the -`other set as well 1llustrated`in Figs.v 1 and 2. The casing member 7 is provided with recesses 15 adapted to receivethe opposite extremities of valve pieces 16, the recesses being shaped to conform with the outline of the corresponding valve pieces, but 'suiiciently large to allow these pieces to move freely therein asis required in order that they may properly perform their function. is 4illustrated in the drawing,.the two cas- -lng members 6 and 7 are circular in shape in face view as indicatedin Figs. 3 and, 4..v

Hence, the various recesses 15 and `their corresponding valve pieces 16, vary 1n length, the central recess 15 and'its corresponding valve piece 16 being the longest, :while the others diminish in length on op- 'posite sides in both directions. .in the drawing, there are five of these valve pieces 16 and a corresponding number of recesses 15,v though it must be understood that the invention is not limited to any pre'- cise or particular number of valve pieces Iand their'co'rresponding recesses. vEach re- 55, Y recesses 15 which the valve piecesoccupy.

, cess 15 yhasa depth conslderably greater than #the thickness of its corresponding valve piece 16 in order to allow the latter an appreciable movement in the recess during the opening and closing action of tHe valve pieces, and in order'to allow a free flow `of fluid from theexit extremities of the inlet passages 12 to the inletl extremities of the exit@ passagesy 18.* Theyalve `pieces 16, as

illustrated in the', drawing, are composed of long narrow thin pieces of steel, their opposite edgesi being *.K. arallel .be veen rounded or semi-circular" xtremities which correspond in shape withthe ends of the l'liemrecesses 15 are, ,properly speaking,

formed only at the opposite ends of the` valve pieces ,and are spaced by 'facing parts v17 ,which are Hush with the flat circumferential face 18 of the casing member 7. Betweenanv two areas 17 on opposite ksides of the member 7, the face ofathefmember is cpt, away flush withjthe faces 20mn opposite sides of the passages l so that the parallel As shown edges of the valve pieces 16 for the greater part o f ltheir length, are located in space and not in engagement with walls as are their extremities which are adjacent the ywalls formed by the areas 17 of this member.

Hence, the valve pieces when in the 4position shown in Fig. 2, overlap the passages 13 between the areas 17 on opposite sides and partly close these passages at their inlet extremities, Vas heretofore explained.

Between the two faces 20 of each partition 21 separating any two passages 13, the

partition 1s provided with a shallow 'recess o r cavity. 22, ywhereby the back fluid pressure from the conduit 14 which acts through theports 23v inthe partitions 21, is free to,V

act on thev valve pieces 16 throughout the ventire length of the latter when the valve pieces are in the open position or in engagement with the faces'20 of the partitions 21 or when the valve pieces are in the position vrshown in-Fig. 2. Were it not for these shallow recesses 22 between the faces 2 0, the fluid pressure `would act when the valve pieces are open as shown in Fig. 2 only on areas corresponding withthe -cross section of the ports 23. As shown in the drawing,

Iseveral of-these ports 23are counterbored as shown at 24 to receive spiral springs 25, which act upon the valve pieces to' normally hold them 1n the closedposition shown in Fig. 1, this condition existing when the' pressureqis cut off from the inlet conduit 26. By virtue of these springs, the valve pieces will be held in the closed position or that shown in Fig. 1, assuming that there is rno pressure except normal atmospheric in either of the conduit members 14 or4 26.

the right-hand portion of the central valve piece is broken away. Hence, in this view. the shallow recesses 22 are exposed by the removal of said valves pieces and by the v'breaking away of the 'other valve piece.

Furthermore, as shown in the drawing, three of the ports 23 of each partition 21 of the casing member 7 are counterbored to receive springs 25, there being one of these springs at each extremity ofeach valve piece 16, a d another springy 25V at thecenter of each alve` piece. It is evident, however,

v that a greater or less number of these springs may be employed. Itis alsoevident that the construction would be4 operative in the absence of these springs, though lprefer to emf ploy them. Aga-in, as shown in the drawing,

and as best illustrated inFig. 3, each partition 21 is provided with two ports 23 lwhich `are of the casing member 7, are removed while Lacasse .7 uncounterbored, and consequently of the same size or oi the'sarne crosssectional area throughout their length, but it 1s evident that the particularP number of these ports is immaterial so long as they are so arranged and oi:V such size as to allow the back pressure tromthe receiver or from the conduit 14 to properly act upon the valve pieces in opposition to the pressure` on the inlet side ot` the valve or on the side v'vlnereV the inlet conduit 26 is located. v

The member of the valve casing has its tace 27 4perfectly tlat and all in. a single plfane. This inner tace ot the casing member 6 'engages and ltits closelyv against the areas 'J and the rim area 18 or the entire fiat ace portion of tbe inner surface of the member .-7. rlhis casing member 6 has its Jface broken only by the inlet passages' 12 which are ci theisame area ci' approiflmately of the same area as the exit passages 13 of the member 7. Thepassages i2 are spaced. by partitions 28 which correspond l`with the partitions 2l of the member 7l i l Y When the valve is in use, it may beheld in place between two conduit members llland 26 as shown in Fig.vv 1, the casing members 6 and Z having shoulders '29 which are e11- .v gaged by adjacent shoulders 30 'formed 4on the two conduit members. ln other words,

i the adjacent extremities of the two members tion with the conduit members.

are circumferentially recessed toreceive a circumferential projection'l formed on the.,

valve casing, considering. the latter in its entirety. rlhe conduit lnembersliand 26 as illustrated in the drawing, are connected Having thus described my invention, what l claim is y l. A ychecltfvalve composed of a casing having` a series of cooperating inlet and exit passages arranged in staggered relation, and

' relatively long, flat, thin valve' pieces mount- 'ed to move bodily and substantially uniformly throughout their entire' length, to- Ward vand away from the" exit extremities of the inlet passages, the inner faces of the casing partitions between the exit passages having shallow recesses and ports in come munication with these recesses, certain "of the'ports being counterbored, and spiral 'springs located in the counterbores of the saidports and acting on thefrfvalve pieces to move them normally into seated relation with' the exit extremities 'of the inlet pas sages.

3. A check valve composed of a casing having inlet and exit passages `arranged in staggered relation andY spacing partitions. with which the casing is provided, and valve pieces supported to more', toward and away by bolts 32 fastened by nuts 33, whereby the valve is securely held in cooperative rela- From the foregoing description the use and operation of my improved. check valve will be readily understood. 'Assuming that it is positioned as shown in Fig. l, and assuming that it is employed in'- connection with anair compressor, theair will enterA the passages 12 of the casing member 6, and act upon the valve pieces l5, to force them away from Vthe exit extremities of the passages l2, in opposition to the action of the spiral'springs 25. The air will then pass first ont ot its course laterally and thence through the passages 13 of the casing member 7, into' the `conduit le which is in com' inunlcatlon with the receiver (not showni.

Another obiect of the shallow'grooves 22 in the faces of the partitions 2l, is to reduce the capillary attraction incident to the coat-- ing of the inner faces of these partitions with oil.- By forming the shallow gro ves 22` the areas of these faces with which be valve pieces are actually in contact, are re-4 duced to a minimum. and the resistance duel to capillary attraction is` negligible.

from the inner faces of .the partitions sep aratng the exit passages, the said :taces ing provided with shallow grooves, whereby the areas which said pieces are adapted to engage are reduced to a minimum, the said partitions being also provided with ports in communication at their inner extremities with said shallow grooves.

il; A check Avalve composed ofA a casing having a series ofcoperating inlet and; enit passages and relatively long, liat, thin valve pieces all mounted to move simultaneously and bodily and substantially uniformly throughout their entire length toward or away-from the exit extremities of the inlet passages vand. tol allowy the 'air to travel through the valve-in one direction only,

the innerfaces ofl the casing partitions be tween' the exit extremities haring shallow recesses, and ports iny communication with these recesses.

In testimony whereof l aiix my signattore,l

in presence of two witnesses.

HENRY t). JACKSGN.

'Witnesses GRACE Heston, fi. Esser OBnisn. 

